The Senate’s failure to bring the long-awaited mayoral-control bill to a vote is “deeply disconcerting,” said a Bloomberg spokesman, who accused the Democratic leadership of breaking a promise to the public.

“The pledge by the Senate leadership to allow a floor vote on the bill should be honored,” said Stu Loeser, Bloomberg’s spokesman.

“We’re going to ask the governor to keep them in Albany until they do.”

Critics of the mayoral-control law, however, disputed the mayor’s charges of a broken promise.

But the Senate never took up an Assembly proposal to renew the 2002 mayoral-control law, which expired June 30.

The bill, which has broad bipartisan Senate support, was expected to be at the top of the agenda yesterday when senators convened for an unusual July session.

But talks broke down over several amendments that some Democrats demanded as a condition for putting the Assembly bill on the floor.

Supporters of the amendments, which include a $1.6 million program to teach parents to advocate for their kids, argue the changes will increase school accountability.

But Bloomberg has dismissed them as unnecessary and potentially expensive.

“It would be wrong to hold the overall governance bill hostage to amendments that have not been the subject of public input, and which can be dealt with at a later date,” Loeser said.

Meanwhile, at least two maverick Democrats, including Sen. Carl Kruger (D-Brooklyn) and Sen. Ruben Diaz Sr. (D-Bronx), announced plans to leave Albany as the session faltered.

Kruger blamed his departure on Bloomberg’s opposition to the mayoral-control amendments and unrelated Republican demands for a fairer split of resources in the closely divided Senate.

“People categorize [the Senate] as a circus,” Kruger said. “I’m not going to be part of the big top.”

Late last night, senators from both parties said they had reached a tentative agreement on a plan to give minority members of the chamber more power to influence legislation, and were expected to vote on it during the early-morning hours.

Privately, some Senate Democrats suggested that they might not have a mayoral-control law before school starts in September.

One of the main critics of the Senate version of the bill who wants to pass the amendments, Sen. Martin Malave Dilan (D-Brooklyn), insisted he was trying to find a middle ground.

“I’m here for as long as it takes to hopefully work something out,” he said.